[126.10] First detection of high velocity gas observed in absorption towards the Cygnus Loop SNR

We report on the first detection of high velocity
interstellar absorption features that can be associated with
the expansion of the Cygnus Loop Supernova Remnant. Recent
observations of several stars with distances in excess of
700pc in line-of-sight towards this SNR have revealed
high-velocity absorption features in the associated
interstellar NaI and CaII lines. Although high velocity gas
has been previously observed in emission towards this
remnant, these new observations pave the way for future UV
observations that can reveal the ionization structure,
temperature and elemental abundance of this expanding shell
of shocked gas.